Control device for photographic cameras



April 4, 1944.

D. L. BABCOCK CONTROL DEVICE FOR PHOTOGRAPHIC CAMERAS Filed 001'.. 28,1941 Fig.

2 Sheets-Sheet l ORNEYS April 4, 1944- D. l. BABcocK 2,345,999

CQNTROL DEVICE FOR PHOTOGRAPHIG CAMERAS Filed Oct. 28, 1941 2She`ets-Sheet 2 65 30m/z8 /05 /07 l /3/ 2,5258 42 la 2/ V86 9.a a7

INVENTOR Patented Apr. 4, 1944 CONTROL DVICE' FOR PHOTGGBAPBIC CAMERASDavid L. Babcock, Rochester, N. Y., assignmto Eastman Kodak Company,Rochester, N. Y., a corporation of New Jersey Application October 28,1941, Serial No. 416,823

2,0 Claims.

The present invention relates to photographic roll film cameras, andmore particularly to cameras of the class which are adaptedqto takepairs ofv stereo pictures. l

It is old in cameras o! this class to provide a film measuring meanswhich is actuated by the movement of the film strip across the camerabody, and which automatically controls a vlocking device which ismovable into vengagement with the film winding mechanism after apredetermined length of film has been wound. After the exposure is made,the locking device is moved to an inoperative position to free thewindingy mechanism so that the latter may now be rendered effective toWind up the two exposed image areas of theiilm strip. s The presentinvention has as one of its objectsV the provision of an arrangement forrendering the film locking device inoperative during the wind up of theleader portion o! the film strip.

A further object of the invention is the provision of an arrangement forinitially adjusting the control member fo;` the locking device to a'predetermined initial position.

^ move the holding means out of holding position to permit the releaseof the locking means.

Yet another object of the invention is the provision oi an arrangementwhereby the shutter ,setting lever or member cannot be actuated a secondtime prior to the making of the exposures, and the winding up of exposedimage areas.

'Yet another object of the invention is the provision of anuinterlock.between the shutter setting and the shutter actuating mechanisms Ybywhich the latter is locked against movement until the setting mechanismhas iirst been operated to set the shutter. n

Tothese and other ends, the invention resides in certain improvementsand combinations of parts, all as will be herein more^fully described?the novel features being pointed out in the claims at the end of thespecification.

In the drawings:

Fig. lis a top pian view of a stereo camera constructed in accordancewith the present invention;`

Fig. 2 isa front view of the camera illustrated in Fig. l;

(ci. sis-31) Fig. 3 is a top view oi a portion of the camera illustratedin Fig. 1, but with the top plate removed, and showing the variousmechanisms,

and the arrangement of the parts at the end of the iilm windingoperation;

' Fig. 4 is a plan view of a portion of the mechanism illustrated inFig. 3 showing the relation of the parts at the completion of theshutter actuation;

Fig. 5 is a plan view of another portion of the mechanism illustrated inFig. 3, but showing the mechanism for moving the locking mechanism outoi' locking relation with the lm winding mechanism, and the structurefor operating the exposure counter;

Fig. 6 is a View Asimilar to Fig. 3, but showing the relation of theparts duringl the film winding operation and just prior to the lockingof the winding mechanism.

Fig. 7 is a vertical sectional view through the camera with partsomitted for purpose of clarity, showing the interconnecting lockinglatch between the shutter setting and the shutter actuating mechanisms,and the position of the parts prior to the operation of the settingmechanism;

Fig. 8 is a partial view of the mechanism illustrated in Fig; '7,showing the relation of the shutter setting and actuating mechanisms,and the interconnecting locking mechanism therebetween;

Fig. 9 is a fragmentary view of the mechanism illustrated in Fig. 7, buton a larger scale than the latter, showing the relation oi the partswhen the shutter setting mechanism has beenoperated to set the shutterand to move the locking latch out of locking engagement with the shuttertrip bar to release the shutter actuating mechanism;

Fig. 10 is a plan view of a portion of the mechanism illustrated inFigs. and 6, but on a larger scale than these figures showing therelation thereto of a throw-out lever which temporarily renders some ofthe locking devices inoperative to permit the making of an intentionaldouble exposure.

Fig. 11 is a fragmentary plan view of a portion of the mechanism shownin Figs. 3 and 6, showing the relation of the film measuring cam and theinitial adjusting cam therefor prior to the windingof the leader'striponto `the take-up spool;

Fig. 12 is a view similar to Fig. 11 showing the relation of'the partsduring the winding upof the leader strip onto the wind-up spool; and

Fig. 13 is a view similar to Figs. 11 and 12 Similar reference numeralsthroughout the various views indicate the same Darts.

vThe present invention relates to a iilm measuring and control devicefor use with a stereo camera provided with shutters f of the settingtype in which one trigger sets or tensions both shutters, and 9. secondtrigger operates or releases the set or tensioned shutters to make thestereo exposures. 'Such 9. camera comprises, in general, a, body havinga iilm casing or compartment in one end of which isA positioned a,

supply spool or retort containing the unexposed iilm strip. The take-upspool is preferably positioned inthe opposite end of the film casing,and is adapted to be rotated to wind up the exposed film. areas thereon,and to bring simulta- 20 neously two unexposedpictures or lm areas intoo exposing position, as is well known. When the film has been moved theproper distance to bring the new unexposed picture frames or areas intoexposing position, the take-up spool is automatically lockedagainst'further rotation oractuation.

The locking means has mounted thereon a movable holding member which isarranged to drop behind a. holding shoulder on the camera 3o body uponengagement of the locking means with the'winding means to holdpositively the locking means in engaging relation. As the locking meansmoves into position to engage the winding means to lock the latter, atooth on theholding a5 member engages and rocks a blocking member orsetting lever lock to move the latter out of the path of the shuttersetting lever so that the latter may be moved to set the shutter. The

shutter setting lever is then actuated to operate l having a pair ofspaced apertures, not shown, ar-

the setting mechanism to tension or set the shutter. Such operationautomatically moves a locking latch out of locking engagement with theshutter actuating or trip mechanism which may now be actuated to makethe exposures. At the completion ofthe exposure operation, a lug on theshutter trip bar engages the holding member to move 'the latter awayfrom the shoulder and vout oi' engaged relation with the blockingmember. The latter' being free, now moves into 50 position to block thesetting lever to prevent a second actuation thereof priorto winding thefilm strip. Such movement of the blocking member supports the holdingmember out of The locking means may then be shifted out ci' locking envengagement with the shoulder.

gagement with the winding means to free the latter so that it may berotatedto wind up the exposed image area. v

The above-described mechanism eectively. prevents 'the making of adouble exposure or theinadvertent winding up of an exposed portion ofthe lm strip. If'desired, a deliberate double exposure may be made. Tosecure this result, an

auxiliaryl lever is provided for moving the locking lever or settinglever lock out of the path of the setting lever Aso that the latter maybe actuated to tension the shutter so that the latter may be operated'asecond time prior to the winding -of the aim strip. After the secondactuation of the shutter, the parts are returned to normal position toprevent the inadvertent orunintentionalmaking of a double exposure.

In stereo cameras for hand use, it is customary to supply a lensseparation and apicture'- 75 formed with a small portion 24 and anenlarged frame separation equal to the normal observersinteroculardistance. If standard 35-mm. moy tion-picture illm is used in such acamera, it hasI been found that the frame size corresponding totheminimum waste and maximum frame size is seven perforation holes long. Inorder to use this desirable size, however, it is necessary to arrange apair of picture framesin such a manner that after the first exposure,the frame is moved one frame only to bring the second pair of pictureframes into position. After the second exposure, however, the lm ismoved a disl-'tance of three frames to bring the third pair of pictureframes into exposing' position. This alternate movement of iirst oneframe and then three frames is continued for each alternate pair ofpicture frames throughout the entire lm A strip. a

In order to secure this one frame, threeframe sequence, the film striphas the pairs of image areas arranged in 'a manner shown and describedin the patent to Young, No. 2,090,017,

ent instance by way of illustration only, in al stereo camera having abody portion or casing I I on the front of which a pair of suitablyspaced objective lens mounts I2 are arranged. The body Il is formed witha partition I3 extending the full length Athereof and dividing theinterior of the camera into a small mechanism compartment, hereinafterdescribed, and a large compartment which houses the .take-up spool Il,

and a supply film retort I5 in which a strip ofunexposed sensitizedfilm, not shown, is wound. The vfilm is guided from the retort I5 to thetakeup spool I6 over film guides, not shown.

ranged in alignment with the two lenses I2,l as is well hewn, wherebytwo picture frames may be exposed at one time. 'I'his specific cameraconstruction is shown and described in the abovementioned patent toYoung, No. 2,090,017,l and to which reference may be had. As thesespeciiic features 'oi' such a cameral are not part of the presentinvention, a detailed showing thereofis not deemed necessary. A suitableknob I6 is provided for rotating the take-up spool I4 to lieving theuser of the camera of the necessity of properly registering the iilm forexposure. -To this end, means is' provided to automatically stop orarrest movement of the film strip when the latter has been moved apredetermined dis-` tance toproperly position a pair of image areas inexposing position.

This arresting means is in the form of a lever 20, off the shape bestshown in Figs. 3 and 6, which is mounted on the partition I3 by a pairoi' studs 2|, one of lwhich extends through a straight, elongated slot22 formed in the lever 20. 'I'he other stud 2| extends through a secondslot 28 in the lever 20, this second slot being portion 25, the purposeof which will be later more fully described. By means of thisarrangement, the lever 2li-is both pivotally and slidably mounted on thepartition I3. The left end 26 of the lever is formed to provide a pawl21 adapted to be moved into engagement with a ratchet 28 connected toand rotatable with the wind-up spool or spindle I4. When the pawl 21 isin engagementv with the ratchet 28, as shown in Fig. 3, the take-upspool I4 is locked against rotation. W'hen, however, the pawl 21 ismoved out of engagement with the ratchet 28, as shown in Fig. 6, thespool i 4 is free and may be rotated to wind up the exposed picture orimage areas thereon, as will be readily apparent to those in the art. Aspring 29 has one end anchored to a stud 33 formed on the partition i3,and the other end secured to the lever 2'0, and tends' to pull the lever28 to the left toward the ratchet 28l and to also pivot the lever in amanner and for a purpose to be later de scribed.

A control disk or iilm spacing cam 33 is rotatably mounted on a stud34-suitably secured to the partition I3, and is provided with tworadially extending notches or open-end slots 35 and 36. These slots areso positioned that the great- Ver distance 31 therebetween is threetimes the' lesser distance 38, as is apparent from an in' The cam 33 isro- I spection of the drawings. tated, by mechanism to be laterdescribed, at such a rate relative to the iihn movement that the lesserdistance 33 corresponds to a movement of one picture frame of the iilm,and the larger distance 31 corresponds to the movement of three pictureAframes.

The lower face of the cam 33 is formed with a gear 39 which meshes witha gear 43 mounted Orl a shaft 4I. The gear 43 in turn, meshes with agear 42 carried by a shaft 43 which also carries a loosely mounted gear44 connected to rotate, through a clutch, with the gear d2. The gear 44finally meshes with a gear 45 carried by the iilm measuring roll shaft46v which is journaled in the partition I3. This shaft 43 extends acrossthe large compartment in iront of the iilm, and has one end journaled inthe partition I3 and the opposite end journaled in the opposite side ofthe camera, not shown.

A sprocket 41 having a plurality of teeth 48, in the present instanceseven, is mounted on' the shaft 46 adjacent the partition I3 in such amanner that the teeth.48 will engage marginal per.

forations, not shown, formed in the film strip F, in a manner well knownin the art. By means of this arrangement, rotation of the sprocket 41will be in deiinite timed relation tothe movement of the lm strip acrossthe camera body.

. As the various gears 39, 40, 42, 44, and 45 operatively connect thesprocket 41 with the cam 33, it is evident that the latter will alsorotate in timed relation to the movement of the film strip. The gearsare so proportioned that a movement of four. picture frames will causeone complete revolution of the cam 33.

When the first pair of image areas are movedinto proper exposingposition, the slot 33 of the cam 33 is now moved, by mechanism to belater described, into legistry with an upturned lug 49 formed on thelever 20. When this position is reached, the lug 49will automaticallymove intothe take-up spool I 4. After the iirst exposure is made, thelever 20 is shifted to the right, in a manner to be later described, todisengage the ,pawl 21 from the ratchet 28 to free the take-up spool i4.The latter is now rotated by rotating the knob I6 to wind up the iirsttwo exposed picture areas and to simultaneously bring the second twopicture areas into exposing position. As this change requires a lmmovement only equal to the length of one picture frame, as pointed outabove, the cam 33 is rotated one-quarter of a revolution, whichrepresents the lesser distance 38, to bring the notch 35 into registrywith the lug 49, whereupon the latter moves into the notch 35 to againbring the pawl 21 into locking engagement with the ratchet 28 to stopfurther film winding.

' When, however, the second pair of picture frames have been exposed,Ait is necessary to move the iilm strip a distance equal to the length.of three picture frames which will thus rotate the cam 33 the greaterdistance 31 between the notches 35 and 36. The specific arrangement ofthe image areas on the strip are clearly shown in the above-mentionedpatent to Young to which reference may be had. When the cam 33 has thusbeen rotated the notch 36, is again brought into registry with the lug43 so that the latter will now move into the notch 36, causing the pawl2i to again move into locking engagement with the ratchet 28 to preventfurther rotation of the take-up spool i4. It is now apparent that thevarious pairs of picture frames may be moved into exposing position;and, when properly p0sitioned, the movement of the film is thenautomatically arrested. Such an arrangement thus. not only insuresproper registration of the picture frames, but'also relieves the camerauser of the necessity of properly registering the picture frames forexposure.

The above-described mechanism is automatmany effective after the nrsrimage areas are moved into exposing position. As is well known, however.iilm strips are provided with a leader section or portion which ismanually secured, in a well-known manner, to the take-up spool. Thisleader strip is then wound up on the take-up spool so as to bring thefirst image areas into exposing position, as is well known in the art.During this initial winding up of the leader portion of the film strip,it is desirable to render the iilm locking means 21 and 28 and the lmmeasuring cam 33 inoperative so as to prevent the locking of the take-upspool during this initial winding operation, the advantages of whichwill be apparent.

To secure this result, a presetting or initiallyadjusting cam 52 isloosely mounted on the stud operatively connected with the cam 52 torotate the latter. After the camera is loaded in the usual andwell-known manner, the knob 53 is given one full turn and then a portionof a turn to bring an indicating mark or dot 54 thereon into registrywith a stationary mark or dot 55, designated as load," formed on thecamera body II. Such a rotation of the cam 52 iirst moves theilatter toa position shown in Fig. l1, in which an arcuate portion 56 overlies andblocks the slots 35 and 36 vof the cam 33. The portion 53 is of aslightly larger diameter than the cam 33 and thus engages and supportsthe lug 4S to prevent the latter from entering the slots 35 andattoactustethemmikingmemtoikthe 452 has moved the cam 33 to an `initialposition of adjustment, as shown in Fig.` 12. It will be apparent fromthis ligure that the lug 49 cannot enter the slots 35 and 36, so thatthe locking mechanism will be rendered ineilective.

Now as the take-up spool Il is rotated, the iilm strip is moved acrossthe camera body, and serves to rotate the sprocket 61. Such rotation,through the gears 45, I4, I2, 48 and 39, rotates the cam 33 in aclockwise direction. During this rotation of the cam 33, the lug I9frictionally en gages the edge of the portion 56 of the cam-52 to holdthe latter stationary. Continued move- 'ment of the iiim strip serves torotate the cam 33 until the pin 58 thereon inally engages a radialshoulder 59a formed on the cam 52, as shown in Fig. 13, at which timeboth of the slots 35 and 36 have been moved out from under the'portion56 of the cam 52. Nowjthe final winding up of the leader stripcontinues' to rotate the cam 33, and through the pin and shoulderconnection 58 and 59, rotates the cam 52 as a unit therewith until theslot 36 is moved into registry with the lug 49, whereupon the lattermoves into the slot 36 to lock the tilm winding mechanism, as abovedescribed.

The parts are so designed and proportioned that the locking of the filmwinding mechanism occurs when the rst two picture areas have been movedinto exposing position behind the lens mount I2. The cam 52, however,provides an arrangement which renders the iilm locking means inoperativeand ineiective during the winding up -of the leader portion of the nlmstrip. Furthermore, the cam 52 servesto move the lm measuring cam ,33 toan initial position of adjustment so that when the iirst two image areasare moved into proper position, the slot 36 will have been brought intoregistry with the lug 9 to permit the locking of the film mechanism toarrest yfurther rotation thereof.

As mentioned above, the cam 33 is operatively connected to the lmengaging mechanism or sprocket 41 through the gears 39, G0, 32, d4, and65. During the initial setting of the cam 33, it is desirable, however,to move the cam 33 relative to the sprocket 41, and hence the lm strip,

(so that the cam 33 will be in a proper initial position relative to thefirst two picture areas on the iilm strip.

In order to secure such relative movement between the cam 33 and thesprocket t1, a sult= able clutch is providedV therebetween so that thecam 33 may be disconnected from the sprocket 41 during such initialadjustment. Such a clutch may be of 'any standard or suitableconstruction.

In 'the present embodiment, however, the clutch comprises, a pawl 59carried by the under side of the gear 44, and ladapted to engage aratchet 69 secured to the lower end ofthe shaft 33, as best Vshown inFig. 7. During the normal operation, the rotation of the gear i5 on theshaft 46 serve to rotate the' gear te, and, through the pawl and ratchet59 and 6E, rotate the shaft 33, gear 42, gears 40 and 39 and iinally cam33. The initial adjustment of the latter serves to turn the ratchet 60relative to the pawl 59 and thus disconnect the cam 33 from the sprocket41.

As the lever 29 is moved to the left to bring the pawl 21 into lockingengagement with the ratchet 28, means are preferably provided forpositively holding or locking the lever in this position so as toprevent the accidental or unintentional disengagement of the pawl andratchet 21 and 26. This holding means comprises, in the presentembodiment, a bellcrank 65 pivotally mounted on a stud 66 carried by thelever 20. This bellcrank 65 is thus secured to and moves as a unit withthe lever 20 and may, therefore, be broadly considered as a partthereof. The bellcrank 65 is formed with a short arm 61 and a longer arm66. The latter is so arranged that when the lever 20- is moved to theleft to bring the pawl 21 into locking engagement with the ratchet 28, alug 69 on the arm 68 drops down behind a shoulder 1I formed on a bracket12 suitably .secured to the' partition i3. The engagement of the lug 69behind the shoulder 1l serves to hold positively the lever 2li to retainthe pawl 21 in locking engagement with the lratchet 28. However, whenthe lever 20 isto be moved to the right to disengage the pawl 21, aswill be later described, the bellcrank lever 65 is first rotated in acounter-clockwise direction about its pivot 66, in a manner to be laterdescribed to disengage the lug 69 from the shoulder 1l to free the lever20. As the lever 20 is then moved to the right, the lug 69 rides alongthe upper surface of' the shoulder 1I, as shown in Fig. 6. 'I'hebellcrank 65V thus provides an arrangement for holding positively thelocking mechanism 21 and 28 in locking relation with the lm windingmechanism, to hold the latter against rotation.

Each of the lens mounts I2 is provided with a shutter mechanism which isactuated during the exposure so that two stereo images aresimultaneously made, as is well known.` Furthermore, the two shuttermechanisms are interconnected so that they may be operated by a singleshutter release or actuating trigger 15. As the particular shutterdesignsA and the interconnecting members therefor constitute no part ofthe present invention, a detailed showing thereof is not deemednecessary.

The shutter trigger 15 is pivoted at 16 on the casing ll and has aportion 11 adapted to engage an upturned gearl or lug 18 formed from theshutter trip bar 19 of the left-hand shutter mechanism. This trip bar isshown as it is utilized in releasing the bell crank 65, infa manner tobe later described. The trip bar 19 of each shutter, only one of winchis shown, is arcuate in shape and formed with arcuate slots adapted toreceive pins 8l secured to the front wall of the camera casing il tomount the tripbar 19 thereon. `As is well known, the pressing of thetrigger 15 will move the trip bar 19 in a clockwise direction to actuateboth of the shutters to make the exposures. This movement of the lefttrip bar 19 brings a lug 82 thereon into engagement with a lug or ear 83formed on the end of the short arm 61 of the bellcrank 65 to rock thelatter in a counter-clockwise direction to disengage thev lug69 from theshoulder` 1I to release the holding means for the lever '28. Uponreleasing the trigger 15, a hairpin spring 84, of well-knownconstruction, serves to return the trigger 15 and the trip bar 19, aswell as the other shutter parts, to an inoperative position, shown inFig. '1. Such a return movement, moves the lug 82 out of engagement withthe ear or lug 83, but means, to be later described.

' thenserves to support the bellcrank 65 to retain the lug 69 of the arm68 out of holding relation with the shoulder 1I. 'I'he lever 20 may nowbe moved to the right by mechanism to b e later described, to disengagethe pawl 21 from the ratciet 28 to free the windingA mechanism and thespool I4 so that the latter may be again rotated to wind up the exposedpicture frames.

'I'he lever 20 may be moved or slid to the right in any suitable manner.Such moving or shifting means comprises, in the present embodiment, apush button 85 mounted to move through an opening in; the casing II andinto engagement with an arm 86 of a bellcrank 81 pivoted at 98 on thepartition I3. Upon pressing the button 85, the bellcrank 81 is firstmoved in a clockwise direction about its pivot to bring the pin 89formed on the other arm 90 thereof into engagement with an oisetextension 9I of the lever 20. Further pressure on the button 85 thencauses a further rocking of the bellcrank 181 which, through the pin 89,moves the lever 29 to the right to disengage the pawl 21 from theratchet 28 to free the lm winding mechanism, as shown in Fig. 6. Theright end of the lever 20 has pivoted thereon, at 93, a pawl 92 the nose94 or" which is arranged to engage a counter ratchet 95 operativelyconnected to the counter dial 96. A spring 'al' is wrapped around thepivot 93 and has one end connected to the pawl 92 to retain the nose 94thereof in engagement with the counter ratchet 95. Now when the lever 20is moved to the right, by pressing the button 85, the pawl 92 moves as aunit therewith. Such rightward movement causes the nose 94 to rotate theratchet 95 one tooth to register the exposure on the counter dial 96. Aspring 98, secured to the partition I3, engages the ratchet 95 toprevent reverse movement thereof when the lever 20 and pawl 92 are movedto the left to lock the nlm winding mechanism, as above described.

As the lever 2i) is moved to the right, the lug 49 is drawn out of theregistering slot 35 or 38 in the lm measuring cam 33. ,Such movementalso moves the left stud 2I out of the small portion 24 of the slot 23to position this left stud 2l in the large portion 25, as shown in Fig.6. The spring 29 then serves to pivot the lever 28ln a .clockwisedirection about the'right stud 2l to move the lug t9 out of registrywith the slot 35 or 36 and onto` the periphery of the cam 33, as shownin Fig. 6. Such movement of the lever 20 may tend tocause the lug 49 torotate the cam 33 in a counter-clockwise direction, the disadvantages ofwhich are apparent.' To remove any such tendency, a spring 99 is mountedon the partition I3y and engages the gear 39, as shown in Figs. 3 and 6.As the winding mechanism is now further rotation of thelm windingmechanism.

During this leftward movement of the lever 20, the lug 69 on the arm 68of the bellcrank 65 rides along the shoulder 1I and nally drops downbehind the shoulder substantially simultaneous with the engagement ofthe pawl 21 with the To this end, each shutter is provided with a shutYter setting shaft I which is connected in a suitable and well-knownmanner to the shutter setting mechanism so that the partial rocking orrotation of the shaft i0!) in a counter-clockwise direction serves to.set or tension the shutter in a manner well known to those in the art.The setting shaft ill of the left-hand shutter has mounted thereon adisk ibi formed with a radially extending arm H92 which has pivotallycon nected thereto at m3 a connecting link it which is likewiseconnected to a similar disk, not shown, and the other shuttersettingshaft, also not shown, so that the rotation of the left shuttersetting shait i90 will, through the disk iti and the link i911,simultaneously set or tension the right-hand shutter. Thus both shuttersmay he simultaneously set or tensioned by the partial rotation oi thesetting shaft i3d o the left-hand shutter, as shown in Fig. 7.

'The shutters may he set by pressing on the knob or shutter settingtrigger iilti mounted on a crank or arm it connected to a rock shaft itlcarried by the casing il. Asecond crank or lever 898 has one endconnected to the shaft itl While the other end has pivoted thereon at 99a connecting rod H9. The lower end oi the latter carries a pin Hi which`moves in a slot M2 formed in the camera casing to guide the rod ll. Itwill now be apparent that the pressing of the trigger IBS' will rock thelever it@ in a counterclockwise direction to move the rod il@ upwardly.This upward movement oi the rod M0 serves to bring a second pin M3thereon into engagement with a cam vi i4 carried by the setting shaft508 `to rock the latter in a counter-clockwise direction to set loothshutters. Thus the pressing of 'the trigger 995 serves to rock thesetting shaft E00 of the left shutter to simultaneously set or tensionboth shutters. After the shutters are thus set, the pressing of theshutter trigger 15 simultaneously releases both shutters to expose twoimage areas ci the lm strip to provide the desired stereo images. i

As is well known in the art, it is very desirable to provide means toprevent the making of a double exposure on am,7 pair of image areas. Itis also known that a second actuation of the trigger 15 will not makethe second exposurel until the setting trigger I05 has first beenactuated a. second time to tension the shutter. Thus, after the shuttershave been tripped, they must be again tensioned before another exposurecan be made. The present invention, therefore, provides a blockingmember which automatically moves into the path of the setting leverafter the shutter trigger has been actuated to lock the setting triggeragainst a second actuation until the film strip has been moved. Thewinding of the film strip then serves to move the blocking member to aninoperative position to free the setting trigger so that it may now beoperated.

This locking means o'f the present invention comprises a setting leverlock or blocking member II'I, of the shape shown in Figs. 3, 4, and 6,mounted for rocking movement on a stud II8 carried by the partition' I3.A spring II9 is wrapped around' the stud II8 and has one end inlengagement with the shoulder 1| and the other end in engagement withanupturned lug or ear |2| formed on theA blocking member The spring I I9tends to rotate or ro'ck the member I |1 in a clockwise direction tomove a radially pro-- this ligure that the portion |22 blocks the upwardmovement of the lever. |00, andthus effectively prevents the actuationof the setting trigger |05 to set the shutters. A l l In order that thelocking member |I1 may be moved to its blocking position so as toeifectively prevent a second actuation of the shutter setting lever |05before the exposed picture areas have been wound, the present inventionprovides an arrangement whereby the movement of the blocking 'memberinto blocking position is-controlled from the operation of' the shuttertripping mechanism.- To secure this result, the bellcrank 65, which, iscarried to the left by the lever 20 during the film locking operation,as mentioned above, is formed with a tooth |25 which is adapted toengage the ear |2| to rotate or rock the blocking member in acounter-clockwise dl-4 rection about the stud H8 .to move the portion|22 out of the path of the lever |08, as shown in Fig. 3, whichrepresents .the position of the parts at the completion of the filmwinding operation. The lever is now free and the setting trigger may bepressed to tension both shutters.

Now when the shutter trigger 'l5 is released, the shutter trip bar 'i9is moved to the right to bring the lug 82 thereof into engagement withthe lug -83 of the arm 67 of the beilcrank lever t5 to rock the latterin a counterclockwise direction to the position shown in Fig. 6. Suchrotation of the beilcrank t5 moves the tooth |25 out of engagement withthe lug or ear |2| of the blocking an eilective arrangement by which anunintentional ldouble exposure'cannot be made. 4.Ther-e' are times,however, when the user may wish to make an intentional or deliberatedouble exposure. To secure this result, the present invention providesan arrangement by which the blocking member ||1 may be moved,independently of the lever and also independently of thel winding of thehlm-'from lits blocking position shown in Fig. 6, to an inoperative ornon-blocking position shown in Fig. v3. This means comprises anauxiliary member |28 mounted on a stud |29 carried b'y the top ofthecasing and formed with a lradially extending operating member |30 whichextends to a point externally of the camera casing. When the member |30is moved from the dotted position shown 1n Fig. 10 to the full-lineposition Vshown therein, a radial linger |3| on the member |20 engagesthearm |21 to rock the blocking member ||1 in'a counterclockwisedirection to move the portion |22 out of the blocking relation with thelever |08. The blocking member ||1 is thus moved to the position shownin Fig. 10, and is again engaged and held by the tooth |25 of thebeilcrank 65, the lever 20 not having been removed to the right torelease the winding mechanism. As the setting trigger |05 is now free,it may be operated to set the shutters, and the shutter trigger 15 maybe again actu-ated to trip the shutters a second time to make theintentional double exposure. After this second A exposure, the blockingmember is again automember |i'i to free the latter. lThe blockingAmember nowmoves, under the action of the spring H9, to bring the portion|22 into a position to overlle and block the lever |08 to prevent asecond actuation of the setting means, as is apparent from an inspectionof Fig. 6. 'Ihus the operation of the shutter actuating or trippingmeans serves to lock the setting means to prevent a second operation ofthe latter. An arm |2'i on the blocking member i Il engages the shoulder'il to limit the rotation of the member ,H7 and to properly position theportion |22 thereof in the path of the lever |08.

As the blocking member il moves to its block ing position, Fig. 6, theear |2| moves under the tooth |25 which is now elevated by reason of therocking of the beilcrank t5 by the lug 32 on the trip bar i9, asdescribed above. The tooth |25 now rests on the upper surface or face ofthe lug i2! which maintains the beilcrank t5 in elevated position tohold the lug 69 out of thepath of the shoulder li. Now when thelever/'20 is moved to the right, by the actuation of the button 85,

. the lm,

The above-described mechanism thus providesfvs return to a position toprevent a subsequent matically returned to its blocking position, shownin Fig. 6, to prevent further operation until the iilm strip is wound,at which time the blocking member -is again moved to its inoperativeposition. as shown in Fig. 3, as mentioned above. 'Ihus under normalconditions, an unintentional double exposure cannot be made, but ifdesired, an intentional double exposure may be made; and at the endthereof, the parts automatically m.. advertent double exposure.

After the shutter is actuated, the lever 20 is withdrawn to the iight tofree the wind-up spool M so that the latter may be rotated to wind up Atthe completion of the winding-up operation, the lever 20 moves to theleft and,

through the tooth |25 and the ear |2|, rocksv the blocking member tofree the' setting lever |05. The parts are then in the position shown inFig. 3. The operator may, however, inadvertentlv actuate the shuttertrigger 'l5 before operating the setting lever |05 to set the shutters.Obviously. an exposure will not be made under such circumstances as theshutters are not 'first' set or tensioned. However, such prematureoperation of the shutter trigger will move the trip bar 79 in aclockwise direction to bring the lug 82 thereon into engagement with thelugt3 and the arm tl of the beilcrank 65. Such engagement will'rock thelatter to disengage the tooth |25 thereof from the ear |2| of theblocking member ili to free the latter so that it may move, under theaction of the spring H9, to the setting lever blocking position as shownin Fig. 6. Thus, the shutter trigger '15,has been actuated and thesetting lever |05 locked without the making of an exposure. Therefore,before the setting lever |05 can be released, the lever 20 must rst beshifted to the right, and the inadvertently unexposed picture areas mustbe wound -onto the take-up spool, thus causing a loss of film, thedisadvantages of which are obvious.

In order to prevent such premature operation of the trigger 15 and theloss of unexposed image areas, the present invention provides aninterlock between'the setting trigger |05 and the tripping trigger 15 sothat the latter cannot be operated until the setting shutters areproperly set or tensioned. To secure this result, a double-arm lever |33is pivoted at |34 on the camera casing Il. One end of the arm is formedwith a catch' |35 adapted to engage in the notch |36 formed on the 'endof the trip bar 19 opposite the lug 82, as best shown in Figs. 7, 8 and9. The other end |31 of the lever |33 is adapted to cooperate with a c|38 mounted on the shutter setting shaft |00. Fig. 7 shows thearrangement ofthe parts after an exposure has been made, the catch |35being then positioned in the notch |36 tof prevent clockwise rotation ofthe trip bar 19, and Ithe other end |31 of the lever |33 beingpositioned behind the cam |33. The shutter trigger 15 is .thuslockedagainst actuation. However, when the setting trigger l is depressed, thesetting shaft |00 is rocked or partially rotated in acounter-clockwisedirection. Such movement -brings the cam |38 under theend |31 ofthe lever |33 to move the latter to the right, as shown inFig. 9, to pivot the lever |33 to shiftthe catch |35 to the left out ofthe notch |38,` as also shown in Fig. 9, to free the trip bar 19. Bymeans of this arrangement, the shutter actuating mechanism is positivelylocked against operation until the shutters havebeen properly set, atwhich time, the actuating mechanism has been unlocked sothat the shuttertrigger may be operated to make the exposure.

The operation of the Idevice may be briefly described as follows: 4Afterthe camera` is loaded, the cam 52 is rstrotated to position the portion56 in overlying relation with the slots 35 and 36 of the nlm measuringcam 33 to prevent the entrance of the lug 38 of the lever 28 into theslots during the winding up of the leader portion of the film strip. Theactuation -of the cam 52, through the portion 51 engaging the pin 53 ofthe cam 33, serves to set the latter to an initial position ofadjustment. When the first image areas of the lm strip are moved intoexposing position, the slots 36 register with the lug 49, 'and thelatter moves into the registering slot under the action 'of the spring29. This serves to shift' the slidable lever to the left-.to vbring thepawl 21 thereof into locking engagement with the.

ratchet 28 of the film winding mechanism to arrest further rotationthereof, as shown in Fig. 3. Upon such engagement, the lug $9` of thebellcrank 65 drops behind the shoulder 1| to hold the lever 20 inlocking position. Simultaneously therewith, a tooth on the bellcrank 65engages a. blocking member ||1 to move or rock the latter out ofblocking relation with the shutter setting mechanism.A The shutter isthen set by pressing the-shutter trigger |05 which rotates the shaft |00to set,the shutters.'y Such a. rotation of shaft |00, through a cam |38,pivots a lever |33 to move a catch |35 out of locking en- Y vto releasethe lug 69 out of holding relation with tle shoulder 1|. The release ofwthebellcrank also moves the tooth |25 thereof out of holding relationwith the blocking'member II1, and

the latter rotates to move the portion |22j thereof into the path of thelever |08 to block the shutter setting mechanism so that it cannot beac- 5 tuated. The button 85 is then pressed in to move the lever 20 tothe right to disengage the winding mechanism and to also actuate thecounter mechanism. An intentional double exposure can be made prior tothe release of the lm blocking means by'actuating the auxiliary lever|28 to rotate the blocking member I |1 to an inoperative position, seeFig. 3, to permit a second actuation of the shutter setting and trippingmechanism. After this intentionaldouble exposure, the .parts 15automatically return to a position to prevent a subsequent inadvertentdouble exposure.

After the last exposure is made on the film strip, the lever 20 isshifted to the right by pressing'the button 85. The supply retort I5 isthen go rotated in any suitable and well known manner to rewind ltheexposed lm thereinto. During this rewind operation, the pawl and ratchet59 and serve to disconnect the film measuring cam 33 from the filmengaging sprocket 31 to 25 free the latter so that itlmay be rotated inreverse direction during rewinding.

While one embodiment of the invention has been disclosed, it is to beunderstood that the inventive idea may be carried out in a number ofways., This application isf therefore, not to be limited to the precisedetails described but is intended to cover all variations andmodifications falling within the scope of the appended mounted on saidbody and formed with an openv end radialslot, film measuring meansincluding a lm engaging member, a lever movably mounted on said body andformed with a portion adapted to move into locking engagement with saidratchet, a lug `carried by said lever, of means including a clutch foroperatively connecting said nlm engaging member to said control memberso that the latter will be rotated in timed relation to the movement ofsaid strip to bringsaid 'slot into registry with said lug when a pre-`determined amount of lm has been moved,

means for moving said lug into said slot to move said lever to bring theportion thereof into locking engagement with said ratchet to arrestmovement of said .winding mechanisml a blocking member loosely mountedin said body adjacent said control member and having a portionmovable'into position to block said slot to prevent the movement of saidlug thereinto during the winding of a leader portion of said strip, andmeans for operatively connecting said blocking member and said controlmember to rotate the dependent movement of said control member to aninitial position ofadjustment.

2. In'a roll film camera, the combination with a camera body, a filmwinding mechanism including awinding spindle for moving a fllm stripacross 4said body, a ratchet carried by said spindle, a stud carried bysaid body, a control meml ber rotatably mounted on said stud and formedwith an open-end radial slot, film measuring means including a nlmengaging member, a lever latter to release said 'clutch to permit theinwith said ratchet to lock said' spindle, a lug carried by said lever,of means including a oneway clutch for operatively connecting said nlmengaging` member to said control member toA rotate the latter in timedrelation to the movement of said lm acrosssaid body to bring said slotinto' registry withsaid lug when a .predetermined amount of iilm hasbeen wound, means for moving said lug into said registering slotto movesaid lever to bring the portion thereof into locking engagement withsaid ratchet to arrest movement of said winding mechanism, a blockingmember loosely mounted on said stud, and means for moving said blockingmember on said stud relative to said control member to position aportion of said blocking member across said slot to close the latter toprevent the movement oi said lug thereinto during the winding of aleader portion of said film strip intoA said spindle.

3. In a roll lm camera, the combination with a camera body, ilm windingmeans for moving a lm strip across said body, means for automaticallyengaging said winding means to lock the latter against further.actuation when a predetermined length of film has been wound, a shutteractuating mec, of a member conn cally engaging said Winding means tolock the latter against furthe;` actuation when a predetermined lengthof lm has been wound, a shutter actuating mechanism, of a member mountedon and movable as a unit with said locking means, stationary means onsaid body adapted to engage said member when said locking means engagessaid winding `means positively to hold said locking means in engagingposition, means on said shutter actuating mechanism for moving saidmember relative to said locking means and out of engagement with themeans on said body matically engaging said winding means to lock thelatter against further actuation when a preydetermined length of nlm hasbeen wound, a

shutter actuating mechanisnaof a holding member movably mounted on saidlocking means but movable as a unit therewith, a xed shoulder formed onsaid body. a lug formed on said hold- ,ing member' and movable intoengagement with said shoulder when said locking means engages saidwinding means to hold positively said locking means in engagingrelation, means for mov- Ving said holding member to disengage said lugfrom said shoulder, means for retaining said lug in disengaged positionto permit said locking locking means out of engaging positiontoiree saidwinding means.

6. In a roll illmcamera, the combination with a camera body, lm windingmeans i'or moving a lm strip across said body, means f or automaticallyengaging said winding means to lock the latter against further actuationwhen a predetermined length of tllm has been wound, a shutter actuatingmechanism, of a holding member`movably mounted on saidlocking means butmovable as a unit therewith, a xed shoulder formed on said body, a lugformed on said holding member and movable into engagement with saidshoulder when said locking means engages said winding means to holdpositively said locking means in engaging relation, means on saidshutter actuating means for moving said holding member relative to saidlocking meansto release said lug from said shoulder, means controlled bythe releasing movement of said holding means to support said lug outofholding relation with vsaid shoulder to permit said locking means tobe moved, and means for shifting .said locking means out of engagingrelation with said winding means to free the latter.

7. In a roll film camera the combination with a camera body, filmWinding means for moving a lm strip across said body, means forautomatically engaging said winding means to lock the latter againstfurther actuation when a predetermined length of nlm has been Wound, a

,shutter actuating mechanism, a shutter setting mechanism, of pivotedblocking means mounted on said body and movable into the path of said v''said locking means' to free said Winding means.

V8. In a roll iilm camera, the combination with a camera body, filmwinding means for moving a lm strip across said body, means forautomatically engaging said winding means to lock the latter againstfurther actuation when a predetermined length of film has been wound, a

shutter actuating mechanism, a shutter setting mechanism, of a memberpivotally mounted on saidbody and formed with a portion arranged to bepositioned in the, path of said setting -mechanism to prevent themovement thereof,

means of said locking means arranged to engage said member to pivotthe'latter to move said' portion out of said path to free said settingmechanism when said locking means engages said winding means, means fordisconnecting said member from said locking means, means tov move saiddisconnected member to position said portion in said path, and means fordisengaging said locking means from said winding means.

9. In a roll film camera, the combination with a camera body, filmwinding means for vmoving av iilm strip across said body, means forautomatically engaging said winding means to lock the latter againstfurther actuation when a predetermined length of film has. been wound, a

shutter actuating mechanism, a shutter setting mechanism, of a shoulderformed on said body,

holding means on said locking means movable means to be moved, and meansfor moving said 15 into engagement with said shoulder when said, lockingmeans engages said winding means to hold said locking means in engagedposition, a blocking member mounted on said body and movable into thepath of said setting mechanism to prevent the operation thereof, meanson said locking means arranged to engage said blocking means to move thelatter out of said path to free said setting mechanism upon the lockingof said winding means, means for concomitantly disconnecting saidholding means from said shoulder and for disconnecting said blockingmeans from 'said locking means, means for moving said disconnectedblocking meansJ into said path, and

means for disengaging said locking means from said winding means to freethe latter.

1G. In a roll lm camera, the combination with a camera body, i'llmwinding means for moving a lm strip across said body, means forA to holdsaid locking means in engaged position' a blocking member mounted onsaid body and movable into the path of said setting mechanism .toprevent the operation thereof, means on said locking means arranged toengage said blocking means to move-the latter lout oi said path to freesaid setting mechanism upon the locking of said winding means,` meansfor concomitantly disconnecting said holding means from said shoulderand for disconnecting said blocking means from said locking means, meanstor moving said disconnected blocking means into said path, means onsaid disconnected blocking means for retaining said holding means out ofengagement with said shoulder, and means for disengaging saidlockingmeans from said winding means to free the latter.

11. In a roll iilm camera, the combination with a camera body, filmwinding means ,for moving a film strip across said body, means forautomatically engaging said winding means to lock the latter againstfurther actuation when a predetermined length of film has been wound, ashutter actuating mechanism, a shutter setting mechanism, o1' a shoulderformed on said body, a member pivotally mounted on said locking meansand movable as a unit therewith, a vlug on said pivoted member movableinto holding relation with said shoulder when said locking meansengagessaid winding means to hold positively said locking means in engagingrelation, a blocking member rockably mounted on said body and formedwith a portion adapted to be moved into the path of said settingmechanism to prevent the actuation thereof, an ear on said blockingmember, a tooth member on said pivoted member movable into engagementwith said ear when said locking means engages said Winding means to rocksaid blocking member to move said portion out of said path, means formoving said pivoted member relative to' said locking means toconcomitantly disengage said lug from said shoulder and to move saidtooth away from-ear to free said blocking member. .means for rockingsaid blocking member to move said portion into said path and to movesaid ear undersaid vtooth to support said pivoted member to retain ofengagement with said winding means to free the latter.

12, In a roll lm camera, the combination with a camera body, lm windingmeans for moving a lm strip across said body, means for automaticallyengaging said winding means to lock the latter against further actuationwhen a predetermined length of lm has been Wound, a shutter actuatingmechanism, a shutter setting mechanism, of blocking means mounted onsaid body and adapted to move into the path of said setting mechanism toprevent the actuation thereof, means on said locking means arranged toengage and move said' blocking means out of said path to free saidsetting mechanism when said locking means engages,l said winding means,means for concomitantly disconnecting said blocking means from saidlocking means and for moving said blocking means into said path uponoperation ci' said shutter actuating mechanism,

means independent of said locking means for moving said blocking meansout of said path to permit asecond actuation oi said setting mechamsmprior to the release of said locking means from said winding 'means'toaord a deliberate double emosure oi' said nlm, and means for releasingsaid flocking means from said winding means to free the latter.

13. In a roll lm camera, the combination with y a camera body, filmwinding means for moving a film strip across said body, means forautomatically engaging said winding means to lock the latter againstfurther actuation when a predetermined iength of nlm has been Wound, ashutter actuating mechanism, a shutter setting mechanism, of a shoulderformed on said body,

a member pivotally mounted on said locking .means and movable as a unittherewith, a lug on said pivoted member movable into holding relationwith said shoulder when said locking means engages said winding means tohold positively `said locking means in engaging relation, a blockingmember rockably mounted on said body and formed with a portion adaptedto be moved into the path ci said setting mechanism to prevent theactuation thereof, an ear on said .blocking member, a tooth member onsaid pivoted member movable into engagement with said ear when saidlocking means is moved into locking relation with said winding means torock said blocking member to move said portion out of said path, meanson said shutter actuating mechanism and operative upon actuation of thelatter to make an exposure for moving' said pivoted member relative tosaid locking means to concomitantly disengage .said lug from saidshoulder and to move said tooth away trom said ear to free said blockingmember, means for rocking said blockmg member to move said portion intosaid path'and to move said ear under said tooth to support 'said pivotedmember to retain said lug out ot holding relation with said shoulder,means independent of said tooth for again rocking said blocking memberto move said portion out of said path to permit a second actuation ofsaid shutter setting and actuating means to permit a second ex- DOsureprior to the release of said locking means from said winding means, thesecond actuation of said shutter actuating mechanism serving to againbring the means on the latter mechanism into operation to again movesaid pivoted mem- -ber to disengage said lug from said shoulder and tofree said blocking member to permit the latter to again rock to moveinto said path and to support said tooth, and means for then moving saidlocking means from said winding means.

e 14. In a roll lm camera, the combination with a camera body, of nlmwinding means for moving a lm strip across said body, lm measuring meansincluding a film engaging member actuated by and in timed relation withthe movement of said iilm across said body, a shutter actuatingmechanism, a shutter setting mechanism, a blocking membery movablymounted on said body and adapted to be positioned in the path'of saidsetting mechanism to prevent the operation thereof, means controlled .bysaid lm engagils'member for moving said blocking member out ofqsaid pathwhen said lm is moved across said body to permit the operation ofsaidsetting mechanism, a locking latch carried by said body and arrangedto be moved into locking engagement with said shutter actuatingmechanism to prevent the operation of the latter, means operativeout oflocking engagement with said shutter acftuating mechanism to release thelatter so that it may be operated to expose said lm, means controlled bythe operation of said shutter actuating mechanism for disconnecting saidblocking member from said dim engaging member, and meansr for thenmoving said blocking member into the path of said setting mechanism toprevent the operation thereof.

15. In a roll lm camera, the combination with a camera body, oi filmwinding means for moving a film strip across said body, lm measuringmeans including a lm engaging member actuated by and in timed rel-ationwith the movement of said lm across said body, a shutter actuatingmechanism, a shutter setting mechanism, a shutter setting leveroperatively connected to said setting mechanism to actuate the latter, ablocking member movably mounted on said body and adapted to bepositioned in the path of said setting lever toprevent the actuation ofsaid setting mechanism, means controlled by said lm engaging member formoving said blocking member out of said path when said iilm ismovedacross said body to permit the movement of said lever to actuatesaid setting mechanism to set said shutter, a locking latch pivotallymounted on said body and having a portion arranged to be moved intolocking engagement with'said shutter actuating mechanism to prevent theopera-- tion of the latter, a cam on said setting mechanism. theoperation of said lever serving to move said cam into engagement withsaid latch to move the latter out of locking engagement with saidshutter actuating mechanism to free the latter so that it may beoperated to make an r exposure, means controlled by the operation oi.'

said shutter actuating mechanism for disconnecting said blocking memberfrom said nlm engaging member', means for moving the disengaged blockingmember into the path of said lever to prevent the actuationI thereof;and means for strip across said body, a control member for controllingsaid locking means, means for releasably connecting said control memberto said measuring means so as normally to be actuatedthereby, a

shutter actuating mechanism, a member conpredetermined length of lmhasbeen Wound,

nlm measuring means including a iilm engaging member actuated by themovement of said iilm strip across said body, a control member forcontrolling said locking means, means for releasably connecting saidcontrol memberto said measuring means so as normally to be actuatedthereby, a shutter actuating mechanism, a member controlled by saidlocking means and movable relation to free said winding means, and meansfor disconnecting lsaid control member from and moving lt relative tosaid measuring means to a predetermined control position of adjustment.

18. In a roll lm camera, the combination with a cameral body, of nlmwinding means for moving .a lm strip across said body, means forautomatically locking said winding means when a predetermined length ofnlm has been wound, iilm measuringmeans including a nlm engaging mem.-ber actuated by the movement of said film strip across said body, acontrol member for controlling said locking means, means for releasablyconnesting said control member to said measuring means so as normally tobe actuated thereby, a shutter actuating mechanism, a shutter settingmechanism, a blocking means mounted on said vbody andmovable into thepath of said setting mechanism to prevent the actuation thereof, meanson said locking means arranged to engage and move said blocking meansout of sai'dpath to free said setting mechanism when Fsaid locking meansengages said winding means, means for concomitantly disconnecting saidblocking means from said locking means and for moving said blockingmeans into said path, and means to disengage said locking means to freesaid winding means.

19. Ina roll lm camera, the combination with a camera body, of lmWinding means for movingv a ilmy strip across said body, means forautomatlcally locking said winding means when a predetermined length ofiilm has beenv wound,

nlm measuring means including. a nlm-engaging y mechanism to preventtheactuationn thereof. means on said locking means arranged to engage andmove said blocking means out o! said path to free said setting mechanismwhen said locking means engages said winding means, means forconcomitantiy disconnecting said blocking means from said locking meansand for moving vsaid blocking means into said path, means to disengagesaid locking means to iiee said winding means, and means'iordisconnecting said control member from and moving it relative to saidmeasuring means to a predetermined `position oi adjustment. l

20. In a roll nlm camera, the combination with a camera body, of filmwinding means for moving a iilm strip across said body, means forautomatically loclring said winding means when a predetermined length ofnlm has been wound, film measuring means including a nlm engaging memberactuated by the movement oi said nlm strip across said body, a controlmember for controlling said locking means, means for rleasablyconnecting said control member to said measuring means so as normally tobe actuated thereby, a shutter actuating mechanism, a shutter settingmeans, means ior disconnecting said control' mechanism, a membercontrolled bysaid locking means and movable into a holding position toretain positively said locking Vmeans in locking position, meanscontrolled by said shutter actuating mechanism for releasing said memberfrom said holding position to permit movement of said locking means,means for moving said locking means out of locking relation to free saidwinding member from and moving it relative to said measuring means to apredetermined control position of adjustmenha blocking means mounted onsaid body and movable into the path of said said blocking means intosaid path, and means to 'disengage said locking means to free saidwinding means,

DAVID L. BABCOCK.

